From owner-freebsd-stable Mon Apr 30 12:30:55 2001 Delivered-To: freebsd-stable@freebsd.org Received: from smtp.bmi.net (smtp.bmi.net [204.57.191.31]) by hub.freebsd.org (Postfix) with ESMTP id EA5A937B423 for ; Mon, 30 Apr 2001 12:30:52 -0700 (PDT) (envelope-from jmcoopr@webmail.bmi.net) Received: from webmail.bmi.net (dsl-154.bmi.net [207.173.60.230]) by smtp.bmi.net (Pro-8.9.3/Pro-8.9.3) with ESMTP id MAA18201; Mon, 30 Apr 2001 12:30:49 -0700 Message-ID: <3AEDBD69.1BBEDA13@webmail.bmi.net> Date: Mon, 30 Apr 2001 12:30:49 -0700 From: John Merryweather Cooper Reply-To: FreeBSD-STABLE Mailing List X-Mailer: Mozilla 4.77 [en] (X11; U; Linux 2.2.12 i386) X-Accept-Language: en-US, en, en-GB MIME-Version: 1.0 To: "Thomas T. Veldhouse" Cc: FreeBSD-STABLE Mailing List Subject: Re: problem with plip stealing clock References: <3AED84DB.8D241BCF@webmail.bmi.net> <010b01c0d1aa$b61ea100$3028680a@tgt.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG "Thomas T. Veldhouse" wrote: > > Sounds like hardware to me. You probably want to run a time program via > cron to periodically update the clock rate. Well, that may be, but it was pretty well-behaved hardware until I used plip--no clock drift whatsoever. I have the daemon running at boot to update off of an external time source, but it seems pretty clear to me that the timer tick interrupt is getting clobbered--else why the drift only when plip is running a transfer? jmc > Tom Veldhouse > veldy@veldy.net > > ----- Original Message ----- > From: "John Merryweather Cooper" > To: "FreeBSD-STABLE Mailing List" > Sent: Monday, April 30, 2001 10:29 AM > Subject: problem with plip stealing clock > > > While using my main workstation as a local FTP for my laptop over plip, > > I noticed that FreeBSD was losing track of time at a prodigious rate. > > Over about five hours of downloading to my laptop, my main workstation > > lost close to 3.5 hours of time off its clock. During pulses of IO, the > > mouse also becomes very sluggish under X. I'd expect some slowdown > > because FreeBSD doesn't appear to use the DMA channel, but I never > > expected to see the affect on the clock--e.g., this message will say > > about 8:30 when the real time here is more like 12:00. Sounds like a > > bug to me . . . > > > > Any thoughts on how to work around/solve this? > > > > jmc > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message